这种热水器应该配置控制逻辑电路，当出现无水或水位太低状况时，能够自动关闭加热元件的电源。
The unit shall be equipped with control logic that shuts down all electricity to the heating elements in the event of no water or low water levels in the tank.
根据供给它的控制信号，或起加法器作用或起减法器作用的一种逻辑元件。
A logic element designed to act as either an adder or a subtracter in accordance with the control signal applied to it.
巢状容器这个物件是逻辑上包含零或多个子元件，并且由某个父元件所拥有，但视觉上不一定如此。
A nested container is an object that logically, but not necessarily visually, contains zero or more child components and is owned by some parent component.
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